Jee presents subsea mattress removal research in Aberdeen


ABERDEEN, United Kingdom – Jee Ltd, an independent multidisciplinary underwater engineering and training company, has signed a contract with Decom North Sea (DNS), representing the decommissioning industry, to identify pioneering recovery and reuse options for concrete underwater mattresses.

An underwater mattress recovery operation. Image: Jee Ltd.

The aim of the project, which began in February 2015 and in which Jee Ltd worked with DNS and Zero Waste Scotland (ZWS), was to identify innovative new solutions for removing underwater mattresses that would function without intervention by the diver during the lifting process Security and reduced costs.

“This project was implemented as a direct response to inquiries from our operator members and Jee’s results were eagerly awaited. Removing mattresses can be very costly in decommissioning projects. Therefore, we would like to develop a variety of solutions to further increase efficiency, ”said Nigel Jenkins, Managing Director of DNS.

Adam Smith, an underwater engineer at Jee Ltd, presented the results at an event jointly hosted by DNS and ZWS on Thursday at the Aberdeen Exhibition & Conference Center. Around 100 oil and gas professionals gathered to discuss key findings from the report and how they can improve industry best practice and the circular economy.

“The significant cost of removing and disposing of aged underwater mattresses is a problem affecting the industry around the world. Identifying innovative new ways to support the decommissioning sector is high on the industry agenda, and DNS’s highly-attended event is the ideal platform to showcase the results of the project, ”said Smith.


Adam Smith, an underwater engineer at Jee Ltd, presented the results. Image: Charles Stewart.

“Our research played a key role in this project, which will provide a basis for the economic and environmental assessment of mattress conditions and options for future removal and reuse. We also helped identify the criteria needed to determine whether to remove underwater mattresses or leave them in place. The main focus is on the safety of underwater divers and the impact on the environment, ”added Smith.

Jee came up with a number of innovative proposals for reusing the mattress concrete, including tidal lagoon structures, building artificial reefs to encourage new marine life, and laying road foundations resulting in less new concrete to be made, reduced carbon dioxide emissions.

“This joint report provides some fascinating insights into extending the life of underwater concrete mattresses. I am sure this will be of great interest to everyone in the oil and gas industry and beyond. The results indicate exciting cross-over potential with other sectors such as offshore renewables. Circular economy practices represent a tremendous economic opportunity for Scotland and the best way to do this is through cross-sectoral and cross-industry collaboration, ”said Iain Gulland, Managing Director of Zero Waste Scotland.

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